With the requirements as above, the author's questionnaire was designed with the following 4 sections: General information including the information should be provided as full name, address, age, ethnicity, number of demographics and family labor, poor-rich classification of households. The second part consists of the basic characteristics of information production and black pepper include the information as an area of growing black pepper, pepper varieties, planting goals, experience, type of soil, the slope of the land, types, forms of cultivation, the number of agricultural extension training, irrigation systems. The third part of information is an important part in which collected information on the investment cost items for the production of black pepper in service in 2014-2016. The last part is the information related to the process of consumption and bank loans for investment in the production of black farmers. The total number of questions should provide information in this questionnaire consists of 30 questions. To make the interview data collection from the farmers cultivate black pepper are convenient, fast and accurate. To obtaining the information quickly, not misinterpreted, the questionnaire was set up by the use of a bilingual English and Vietnamese (see Appendix 1A).
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